CN105463579B - A kind of process preparing calcium sulfate crystal whiskers using active carbon desulfurization - Google Patents
A kind of process preparing calcium sulfate crystal whiskers using active carbon desulfurization Download PDFInfo
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- CN105463579B CN105463579B CN201511028467.8A CN201511028467A CN105463579B CN 105463579 B CN105463579 B CN 105463579B CN 201511028467 A CN201511028467 A CN 201511028467A CN 105463579 B CN105463579 B CN 105463579B
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- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B29/00—Single crystals or homogeneous polycrystalline material with defined structure characterised by the material or by their shape
- C30B29/10—Inorganic compounds or compositions
- C30B29/46—Sulfur-, selenium- or tellurium-containing compounds
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- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B29/00—Single crystals or homogeneous polycrystalline material with defined structure characterised by the material or by their shape
- C30B29/60—Single crystals or homogeneous polycrystalline material with defined structure characterised by the material or by their shape characterised by shape
- C30B29/62—Whiskers or needles
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- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B7/00—Single-crystal growth from solutions using solvents which are liquid at normal temperature, e.g. aqueous solutions
- C30B7/14—Single-crystal growth from solutions using solvents which are liquid at normal temperature, e.g. aqueous solutions the crystallising materials being formed by chemical reactions in the solution
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Abstract
The present invention provides a kind of process that calcium sulfate crystal whiskers are prepared using active carbon desulfurization, sulfur dioxide regeneration gas including being generated using active carbon flue gas desulfurizing purification process successively includes that washing cooling and lime slurry carry out calcium reaction of Salmon-Saxl, oxidation acidizing crystal and thickening and obtain target product as raw material.The present invention is using the sulfur dioxide generated from active carbon flue gas desulfurizing purification process as raw material, obtain high-purity high value added product calcium sulfate crystal whiskers, it does not need to extract intermediate products simultaneously, high production efficiency, technical process is simple, environmentally friendly, and energy consumption is also low, different calcium sulfate crystal whiskers can be obtained by different control conditions, and the content of calcium sulfate is up to 98% or more.
Description
Technical field
The invention belongs to chemical products production fields more particularly to a kind of utilization active carbon desulfurization byproduct to prepare calcium sulfate
The process of whisker.
Background technique
Calcium sulfate crystal whiskers, alias: crystal whisker of gypsum, gypsum fiber are grown with single crystal form, have uniform cross section, complete
Whole shape, the threadiness of perfect internal structure (must shape) monocrystal.Calcium sulfate crystal whiskers have two water (CaSO4·2H2O), half water
(CaSO4·1/2H2) and anhydrous (CaSO O4) point.It has wide purposes, can be used as paper making raw material, as plastics, rubber
Glue, polyurethane, metal and ceramics reinforcing component, be the substitute of asbestos as friction material, it may also be used for environmental project side
Face, the objectionable impurities that can be used in filtering material removing exhaust gas and waste water.
Currently, the production of industrialized calcium sulfate crystal whiskers mainly has hydro-thermal method mainly using the natural gypsum as raw material both at home and abroad
It is that the dihydrate gypsum suspension by mass fraction less than 5% is added to high-temperature pressure-proof appearance with two methods of normal pressure acidization: hydro-thermal method
It handles, is depressed in saturated vapor, dihydrate gypsum becomes tiny acicular semi-hydrated gypsum, then handles through stable crystal formation, obtains in device
To hemihydrate calcium sulfate crystal whisker, this method feed quality requirements are high, high production cost, using being restricted；Normal pressure acidization refers to
At a certain temperature, high concentration dihydrate gypsum suspension can be transformed into needle-shaped or fibrous half-H 2 O calcium sulphate in an acidic solution
Whisker.Compared with hydro-thermal method, the method does not need high-temperature pressure-proof container, and the quality requirement of raw material is low, is easy to reduce cost, but
A large amount of acid sludges of outlet, seriously polluted are needed, development prospect is general.
And 90% or more the energy resource structure in China, using fire coal as power, burning coal can all be generated containing SO2Exhaust gas,
Desulfurizing and purifying is carried out to sulphur-containing exhaust gas using active carbon, the high-concentration sulfur dioxide of generation is all used to produce the concentrated sulfuric acid substantially,
Not only attached value is low, and market tends to be saturated, and the concentrated sulfuric acid is harmful influence, is stored, it is very inconvenient to transport.
Summary of the invention
It is an object of the present invention to provide one kind to adsorb sulfur dioxide by active carbon from sulfur-containing smoke gas, and it is low miscellaneous to generate high concentration
The sulfur dioxide regeneration gas of matter, and sulfur dioxide regeneration gas is aoxidized acidization by medium temperature and is produced into high value added product sulfuric acid
The production method of calcium pyroborate.
To realize that goal of the invention, the present invention adopt the following technical scheme that:
A kind of process preparing calcium sulfate crystal whiskers using active carbon desulfurization, including work is purified with active carbon flue gas desulfurizing
The sulfur dioxide regeneration gas that skill generates is raw material, successively includes that washing cools down, calcium reaction of Salmon-Saxl is carried out with lime slurry, oxidation is acidified
Crystallization and thickening obtain target product.
The acquisition of sulfur dioxide regeneration gas in the present invention can refer to the patent of inventor's previous application, Patent No.
201320086268.2 a kind of entitled flue gas desulfurization and denitrification tower based on active carbon, we term it active carbon desulfurizations here
Adsorption tower.
The concentration of heretofore described sulfur dioxide regeneration gas is 5% or more.
More specifically, the present invention is about a kind of process for preparing calcium sulfate crystal whiskers using active carbon desulfurization, including such as
Lower specific steps:
1, the sulfur dioxide regeneration gas generated through active carbon desulfurization absorption Analytic Tower is cooled down and is washed, reduce temperature
Impurity is removed, sulfur dioxide regeneration gas is cooled to 40-80 DEG C, the solution after washing collects spare, the cooling washing process energy
Remove a small amount of impurity contained after parsing from activity；
2, the quick lime containing CaO90% or more or the lime stone containing CaO52% or more are made to the lime slurry of 5-20%；
3, using adsorption reaction tower that the sulfur dioxide regeneration gas warp after 5-20% lime slurry and washed cooling is multiple
Spray reaction generates calcium sulfite, and the sulfur dioxide regeneration gas enters in adsorption reaction tower, uniformly divides through air-flow even distributor
Cloth sufficiently reacts with the lime slurry of multilayer sprinkling from top to bottom in spraying zone, then removes most of water by demister
Point, then send active carbon desulfurization absorption Analytic Tower back to；
4, enter oxidation acidification slot from the reaction solution of adsorption reaction tower extraction 15-20% concentration and carry out waterfall gas or stirring oxygen
Change, and the solution being added simultaneously into oxidation acidification slot after the washing that step 1 is collected is acidified；
5, after oxidation acidification reaches requirement, heat filtering is carried out rapidly to acquired solution, subsequently into sedimentation basin carry out it is cooling,
Crystallization and precipitating obtain target product.
Preferably, the step 1 includes that sulfur dioxide regeneration gas is first cooled to 150 DEG C hereinafter, same using heat exchanger
When heat a part for swapping out be used to make oxidation acidification slot heating, another part is used to exsiccated calcium sulfate whisker finished product, works as dioxy
Change after sulfur regeneration gas is cooled to 150 DEG C or less, using cooling down scrubbing tower with room temperature atomizing spray water for sulfur dioxide regeneration gas
Wash cooling to 40-80 DEG C, collect atomizing spray after solution for standby, this process can remove simultaneously parsed from activity after contain
The a small amount of impurity having；
Step 1 as described above further includes that solution after collecting obtained atomizing spray to step 1 is filtered processing.
Preferably, the sulfur dioxide regeneration gas in the step 3 enters adsorption reaction tower with the speed of 0.5-2.5m/s
Interior, adsorption reaction tower sulfur dioxide in tail gas is lower than 50mg/Nm3, the slurries and the liquid gas of sulfur dioxide regeneration gas of the spray
Than for 16-40L:1Nm3, the reaction temperature in the adsorption tower is 45-65 DEG C.
Preferably, the acidification slot of oxidation described in the step 4 is rectangular or circular steel construction slot, liner is acidproof
Heatproof glass flakes clay, interior to be equipped with oxidation waterfall tracheae and heating tube, the reaction condition of the acidification is to adjust reaction solution
PH value be 1.8-4.5, reaction temperature be 100-150 DEG C, the time is about 3-25min；
Preferably, described in the step 4 wash after solution pH value be 1.5-4.5, about 60-95 DEG C of temperature, when
When the acidity of cleaning solution is not achieved control and requires, it can add and use part of sulfuric acid；The temperature of solution after washing is not achieved control and wants
When asking, the part hot gas or steam obtained with step 1 heat exchange carries out supplementary heating.
Do not cool down rapid filtration preferably, the heat filtering in the step 5 refers to solution, cyclone is used after precipitating
It is concentrated and is dehydrated with dewaterer, obtain filter cake；It is obtained again using heat pipe heat exchanging described in drying machine step 1
Part hot gas carries out low temperature drying to filter cake and obtains target product.
In the present invention, in oxidation acidification crystallization processes, under conditions of pH value is 2-3, the higher (highest 150 of souring temperature
DEG C), the calcium sulfate crystal whiskers crystallization water is fewer, wherein the content highest of anhydrous calcium sulfate whisker.
The beneficial effects of the present invention are embodied in: it is former with the sulfur dioxide generated from active carbon flue gas desulfurizing purification process
Material, obtains high-purity high value added product calcium sulfate crystal whiskers, turns waste into wealth, while not needing to extract intermediate products, production efficiency
Height, technical process is simple, environmentally friendly, and energy consumption is also low, can obtain different calcium sulfate crystal whiskers by different control conditions,
And the content of calcium sulfate is up to 98% or more.
Detailed description of the invention
Fig. 1 is the process flow chart of the invention that calcium sulfate crystal whiskers are prepared using active carbon desulfurization.
Specific embodiment
The present invention is described further combined with specific embodiments below.
Embodiment 1:
A kind of process preparing calcium sulfate crystal whiskers using active carbon desulfurization, including
1, it is cooled down and is washed to through active carbon desulfurization absorption Analytic Tower generation sulfur dioxide, reduced temperature and remove impurity elimination
Matter；Heat one that first 250-330 DEG C of sulfur dioxide regeneration gas is cooled to 120 DEG C, while swapped out using heat exchange of heat pipe
Divide and be used to make oxidation acidification slot heating, another part is for drying finished product i.e. calcium sulfate crystal whiskers, when sulfur dioxide regeneration gas is cold
But to after 120 DEG C, then using cooling scrubbing tower with room temperature atomizing spray water by sulfur dioxide wash cooling to 40 DEG C, collect atomization
Solution after spray, this process can remove a small amount of impurity contained after active parse simultaneously, spray to the atomization of collection
Solution after leaching is filtered, and the pH value of the solution after adjusting washing with sulfuric acid is 1.5-4.5, and about 60-95 DEG C of temperature, temperature reaches
The part hot gas or steam obtained when less than temperature, that is, boiling temperature required for being acidified with heat exchange carries out supplementary heating；
2, the quick lime containing CaO90% or more or the lime stone containing CaO52% or more are made to 5% lime slurry；
3,5% lime slurry is reacted through repeatedly spray with the sulfur dioxide after washed cooling by life using adsorption reaction tower
At calcium sulfite: sulfur dioxide regeneration gas enters adsorption reaction tower with the speed of 0.5m/s, is uniformly distributed through air-flow even distributor,
Spraying zone is sufficiently reacted with the lime slurry of (4-6 layers) of multilayer sprinklings from top to bottom, makes titanium dioxide in adsorption reaction tower tail gas
Sulphur is lower than 50mg/Nm3, then removes most of moisture by demister, then is recycled to active carbon desulfurization absorption Analytic Tower, spray
Slurries and the liquid-gas ratio of clean sulfur dioxide (gas) be 16L:1Nm3, 45 DEG C of interior reaction temperature of tower (kettle).
4, enter oxidation acidification slot progress waterfall gas from the reaction solution that the extraction of adsorption reaction tower reaches 15-20% concentration or stir
Oxidation is mixed, and cleaning solution is added into oxidation acidification slot simultaneously and is acidified, the oxidation acidification slot is rectangular or circular
Steel construction slot, liner acid-resistant and heat-resistant glass flakes clay is interior to be equipped with oxidation waterfall tracheae and heating tube, with to solution carry out oxidation and
Heating, the reaction condition of the acidification are the pH value 1.8-4.5 of reaction system, and the temperature of acidification is 100 DEG C, and the time is about 3-
25min；
5, after oxidation acidification reaches requirement, to solution rapid filtration (making not cool down), subsequently into sedimentation basin carry out it is cooling,
Then crystallization and precipitating use cyclone to be concentrated and be dehydrated with dewaterer (centrifugal dehydration or vacuum filtering and dewatering),
Obtain filter cake；Low temperature drying is carried out to filter cake using the part hot gas that drying machine is obtained with heat pipe heat exchanging again and obtains finished product, is detected
The content of calcium sulfate is 98%.Exhaust gas after drying is washed with water tower washing rear outlet up to standard after deduster dedusting.
Embodiment 2:
A kind of process preparing calcium sulfate crystal whiskers using active carbon desulfurization, including
1, it is cooled down and is washed to through active carbon desulfurization absorption Analytic Tower generation sulfur dioxide, reduced temperature and remove impurity elimination
Matter；Heat one that first 250-330 DEG C of sulfur dioxide regeneration gas is cooled to 130 DEG C, while swapped out using heat exchange of heat pipe
Divide and be used to make oxidation acidification slot heating, another part is for drying finished product i.e. calcium sulfate crystal whiskers, when sulfur dioxide regeneration gas is cold
But to after 130 DEG C, then using cooling scrubbing tower sulfur dioxide is cooled to 60 DEG C with room temperature atomizing spray water, collects atomizing spray
Solution afterwards, this process can remove a small amount of impurity contained after active parse simultaneously, after the atomizing spray of collection
Solution be filtered, the pH value of solution after adjusting washing with sulfuric acid is 1.5-4.5, and about 60-95 DEG C of temperature, temperature is not achieved
The part hot gas or steam obtained when temperature, that is, boiling temperature required for being acidified with heat exchange carries out supplementary heating；
2, the quick lime containing CaO90% or more or the lime stone containing CaO52% or more are made to 12% lime slurry；
3,12% lime slurry is reacted with the sulfur dioxide after washed cooling through repeatedly spray using adsorption reaction tower
Generate calcium sulfite: sulfur dioxide regeneration gas enters adsorption reaction tower with the speed of 1.2m/s, is uniformly distributed through air-flow even distributor,
It is sufficiently reacted in spraying zone with the lime slurry of (4-6 layers) of multilayer sprinklings from top to bottom, makes dioxy in adsorption reaction tower tail gas
Change sulphur and is lower than 50mg/Nm3, most of moisture then is removed by demister, then be recycled to active carbon desulfurization absorption Analytic Tower, spray
The liquid-gas ratio of the slurries of leaching and clean sulfur dioxide (gas) is 40L:1Nm3, 55 DEG C of interior reaction temperature of tower (kettle).
4, enter oxidation acidification slot progress waterfall gas from the reaction solution that the extraction of adsorption reaction tower reaches 15-20% concentration or stir
Oxidation is mixed, and cleaning solution is added into oxidation acidification slot simultaneously and is acidified, the oxidation acidification slot is rectangular or circular
Steel construction slot, liner acid-resistant and heat-resistant glass flakes clay is interior to be equipped with oxidation waterfall tracheae and heating tube, with to solution carry out oxidation and
Heating, the reaction condition of the acidification are the pH value 1.8-4.5 of reaction system, and the temperature of acidification is 120 DEG C, and the time is about 3-
25min；
5, after oxidation acidification reaches requirement, to solution rapid filtration (making not cool down), subsequently into sedimentation basin carry out it is cooling,
Then crystallization and precipitating use cyclone to be concentrated and be dehydrated with dewaterer (centrifugal dehydration or vacuum filtering and dewatering),
Obtain filter cake；Low temperature drying is carried out to filter cake using the part hot gas that drying machine is obtained with heat pipe heat exchanging again and obtains finished product, is detected
The content of calcium sulfate is 98%.Exhaust gas after drying is washed with water tower washing rear outlet up to standard after deduster dedusting.
Embodiment 3:
A kind of process preparing calcium sulfate crystal whiskers using active carbon desulfurization, including
1, it is cooled down and is washed to through active carbon desulfurization absorption Analytic Tower generation sulfur dioxide, reduced temperature and remove impurity elimination
Matter；Heat one that first 250-330 DEG C of sulfur dioxide regeneration gas is cooled to 150 DEG C, while swapped out using heat exchange of heat pipe
Divide and be used to make oxidation acidification slot heating, another part is for drying finished product i.e. calcium sulfate crystal whiskers, when sulfur dioxide regeneration gas is cold
But to after 150 DEG C, then using cooling scrubbing tower sulfur dioxide is cooled to 80 DEG C with room temperature atomized water, after collecting atomizing spray
Solution, this process can remove a small amount of impurity contained after active parse simultaneously, to molten after the atomizing spray of collection
Liquid is filtered, and the pH value of the solution after adjusting washing with sulfuric acid is 1.5-4.5, and about 60-95 DEG C of temperature, acidification is not achieved in temperature
The part hot gas or steam obtained when required temperature, that is, boiling temperature with heat exchange carries out supplementary heating；
2, the quick lime containing CaO90% or more or the lime stone containing CaO52% or more are made to 20% lime slurry；
3,20% lime slurry is reacted with the sulfur dioxide after washed cooling through repeatedly spray using adsorption reaction tower
Generate calcium sulfite: sulfur dioxide regeneration gas enters adsorption reaction tower with the speed of 2.5m/s, is uniformly distributed through air-flow even distributor,
It is sufficiently reacted in spraying zone with the lime slurry of (4-6 layers) of multilayer sprinklings from top to bottom, makes dioxy in adsorption reaction tower tail gas
Change sulphur and be lower than 50mg/Nm3, then remove most of moisture by vortex-flow and defrosting device, then is recycled to toward active carbon desulfurization absorption solution
The liquid-gas ratio of analysis tower, the slurries of spray and clean sulfur dioxide (gas) is 25L:1Nm3, 65 DEG C of interior reaction temperature of tower (kettle).
4, enter oxidation acidification slot progress waterfall gas from the reaction solution that the extraction of adsorption reaction tower reaches 15-20% concentration or stir
Oxidation is mixed, and cleaning solution is added into oxidation acidification slot simultaneously and is acidified, the oxidation acidification slot is rectangular or circular
Steel construction slot, liner acid-resistant and heat-resistant glass flakes clay is interior to be equipped with oxidation waterfall tracheae and heating tube, with to solution carry out oxidation and
Heating, the reaction condition of the acidification are the pH value 1.8-4.5 of reaction system, and the temperature of acidification is 150 DEG C, and the time is about 3-
25min；
5, after oxidation acidification reaches requirement, to solution rapid filtration (making not cool down), subsequently into sedimentation basin carry out it is cooling,
Then crystallization and precipitating use cyclone to be concentrated and be dehydrated with dewaterer (centrifugal dehydration or vacuum filtering and dewatering),
Obtain filter cake；Low temperature drying is carried out to filter cake using the part hot gas that drying machine is obtained with heat pipe heat exchanging again and obtains finished product, is detected
The content of calcium sulfate is 98%.Exhaust gas after drying is washed with water tower washing rear outlet up to standard after deduster dedusting.
The resulting calcium sulfate crystal whiskers of embodiment 1 to 3 are detected, following data are obtained.
Claims (6)
1. a kind of method that the sulfur dioxide regeneration gas generated using active carbon flue gas desulfurizing prepares calcium sulfate crystal whiskers, feature exist
It successively include washing cooling and lime in the sulfur dioxide regeneration gas generated using active carbon flue gas desulfurizing purification process as raw material
Slurries carry out calcium reaction of Salmon-Saxl, oxidation acidizing crystal and thickening and obtain target product, comprise the following specific steps that:
A, the sulfur dioxide regeneration gas generated through active carbon desulfurization absorption Analytic Tower is cooled down and is washed, reduced temperature and remove
Sulfur dioxide regeneration gas is cooled to 40-80 DEG C by impurity, and the solution collection after washing is spare, which can remove
The a small amount of impurity contained after being parsed from activity；
B, the quick lime containing CaO90% or more or the lime stone containing CaO52% or more are made to the lime slurry of 5-20%；
C, 5-20% lime slurry and the sulfur dioxide regeneration gas after washed cooling are repeatedly sprayed using adsorption reaction tower
Reaction generates calcium sulfite, and the sulfur dioxide regeneration gas enters in adsorption reaction tower, is uniformly distributed through eddy flow coupler,
Spraying zone is sufficiently reacted with the lime slurry of multilayer sprinkling from top to bottom, then removes most of water by vortex-flow and defrosting device
Point, then it is recycled to active carbon desulfurization absorption Analytic Tower；
D, enter oxidation acidification slot from the reaction solution of adsorption reaction tower extraction 15-20% concentration and carry out waterfall gas or stirring oxidation,
And the solution being added simultaneously into oxidation acidification slot after the washing that step A is collected is acidified；
E, after oxidation acidification reaches requirement, heat filtering is carried out rapidly to acquired solution, cooling is carried out subsequently into sedimentation basin, crystallizes
Target product is obtained with precipitating.
2. the sulfur dioxide regeneration gas according to claim 1 generated using active carbon flue gas desulfurizing prepares calcium sulfate crystal whiskers
Method, it is characterised in that the concentration of the sulfur dioxide regeneration gas be 5% or more.
3. the sulfur dioxide regeneration gas according to claim 1 generated using active carbon flue gas desulfurizing prepares calcium sulfate crystal whiskers
Method, it is characterised in that the step A includes that sulfur dioxide regeneration gas is first cooled to 150 DEG C hereinafter, same using heat exchanger
When heat a part for swapping out be used to make oxidation acidification slot heating, another part is used to exsiccated calcium sulfate whisker finished product, works as dioxy
Change after sulfur regeneration gas is cooled to 150 DEG C or less, using cooling down scrubbing tower with room temperature atomizing spray water for sulfur dioxide regeneration gas
Solution for standby of the wash cooling to 40-80 DEG C, after collecting atomizing spray.
4. the sulfur dioxide regeneration gas according to claim 3 generated using active carbon flue gas desulfurizing prepares calcium sulfate crystal whiskers
Method, it is characterised in that the solution after collecting atomized spray to step A is filtered processing.
5. the sulfur dioxide regeneration gas according to claim 1 generated using active carbon flue gas desulfurizing prepares calcium sulfate crystal whiskers
Method, it is characterised in that it is rectangular or circular steel construction slot that oxidation described in the step D, which is acidified slot, and liner is acidproof
Heatproof glass flakes clay, interior to be equipped with oxidation waterfall tracheae and heating tube, the reaction condition of the acidification is to adjust reaction solution
PH value be 1.8-4.5, reaction temperature be 100-120 DEG C, time 3-25min.
6. the sulfur dioxide regeneration gas according to claim 3 generated using active carbon flue gas desulfurizing prepares calcium sulfate crystal whiskers
Method, it is characterised in that the pH value of the solution after washing described in the step D is 1.5-4.5,60-95 DEG C of temperature, when washing
It is 1.5-4.5 that pH value, which is not achieved, in the acidity of solution after washing, adds and uses part of sulfuric acid；The temperature of solution after washing is not achieved
60-95 DEG C, supplementary heating is carried out with the step A part hot gas to exchange heat or steam.
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| CN103757705A (en) * | 2013-12-20 | 2014-04-30 | 淮南市明月环保科技有限责任公司 | Preparation method of anhydrous calcium sulfate whisker |
| CN103900388A (en) * | 2014-04-13 | 2014-07-02 | 连芷萱 | System and method for recycling residual energy of sintering machine |
| CN203922919U (en) * | 2014-05-30 | 2014-11-05 | 湖南中冶长天节能环保技术有限公司 | A kind of active carbon desulfurization denitration acid-making process Waste Water Treatment |
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| CN103757705A (en) * | 2013-12-20 | 2014-04-30 | 淮南市明月环保科技有限责任公司 | Preparation method of anhydrous calcium sulfate whisker |
| CN103900388A (en) * | 2014-04-13 | 2014-07-02 | 连芷萱 | System and method for recycling residual energy of sintering machine |
| CN203922919U (en) * | 2014-05-30 | 2014-11-05 | 湖南中冶长天节能环保技术有限公司 | A kind of active carbon desulfurization denitration acid-making process Waste Water Treatment |
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